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I recently bought a '90 XF Ute (unleaded and gas), mainly to use as a tow unit for a vintage car. It has only done 120,000 km and looks great, runs well, etc. - but, once warmed up, oil pressure drops as the engine speeds up! Have fitted a new (mechanical) oil gauge. I read somewhere that the problem may be related to blocked oilways in the head, or a lifter problem (can get noisy when starved, but that's no surprise. Have replaced oil pump (including relief valve), mains and big ends. Shaft looks virtually as new. Do I rip the head off and start working down from the top, or would somebody like to sell me a good engine?
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Sounds typical Ford 6. They are like that from almost new.
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Did you replace the oil pump with a factory spec one or a high volume pump? If you don't have a HV pump, I'd consider putting one in before swapping engines.
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Volume is not pressure !
If you put a HV pump in, it will only load up the drive for the pump usually ending up in breaking or twisting something like drive shafts or breaking gears. I would use a standard pump which will not increase the drive load. the
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High pressure was all ther age in the early 70's as everyone thought this to be the ultimate for an oiling system as that's what al the race car guys used. High pressure is great when turning high RPMs but of the 3 Fordbooks I have that talk about rebuild
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m8 ya got me wrong. I never said anything about HIGH PRESSURE I warned about going overboard thats it ,I do believe I said something like pick it up a bit.
In the past I have also used HV pumps some with good results and some bad problems .You will build
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Ok, not trying to sound condescending at all here... But. Good idea on the aftermarket oil pressure gauge but are you aware that as oil heats it becomes less honey like and thusly oil pressure drops, lets say its at 120psi on startup it should drop to abo
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I apologize Smiley as i thought wrong about your post. As long as you don't get too thick of an oil you should not load up but you're right on the oil pump drive shaft...it's worth the extra $$ to get an aftermarket hi-perf kick ass strong one.
Doug
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Thanks all for your suggestions. Just to clarify, I'm talking 40-50psi cold start/run, and after full warm up about 5psi idle, rising slowly to 15psi at about 2000 rpm, then falling back to 5psi by 2500. Lifters start to starve after about 15 minutes ru
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